Diamagnetic separation.



PATENTED JUNE 16, 1903.

E. GATES. DIAMAGNETIG SEPARATION.

APPLIYOATIOH nun m3. 1, 1900.

no MODEL.

Iatented. June 16, 1963.

PATENT OFFIGE;

ELMER GATES, OF (CHEVY CH SE, MARYLAND, ASSIGNQR TO-THEQDORE J.

MAYER; OF WASHINGTON,

DIs'rRIoror COLUMBIA.

j'DlAMAGNETl C SEPARATION;

srnclrrcaarron forming part of Letters Patent No. 731,036, dated June 16,1903. i

Application'filedMaJ-ch 1,1990. Saris-1N0 6.948. on) model) ToaJZL whom it may concern:

- -Be it known that I, ELMER GArEs, a' citizen of the United States, residing at Chevy Chase,

in the county of Montgomery and State-of Maryland, have invented certain new and useful Improvements in Diam agnetic Separation; and I do hereby declare the following;

to be a full, clear, and exact description of the v invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

In an application for Letters Patent of the United States filed by me September26,1899,

.Serial No. 731,762, I have described and rated have gradually moved out from the mixture intoa relatively weak" part-"of the field and. then collecting said particlesseparately as heads.

- My present invention is foundeduponthe discovery that when the mixture is fed into the field so as to drop'immediately adjacent to the pole-faces the diamagnetic particles of greater susceptibility will move toward the center of the interpolar space and may be collected by a hopper located immediately below the center of said space, while the remainder of the mixture may be collected in a separate hopper or hoppers. p

In the accompany-ing drawings, Figure 1- represents a front elevation of one form of apparatus adapted for the, practice of my in- Vention. Fig. 2 represents a central vertical; section thereof. 1

Similar letters of reference indicate similar parts in both views. I

Referring to the drawings, II indicates the yoke, F the core, and J the energizing-bobbins of an electromagnet, whose pole-pieces face each other, so as to leave an interpolar space, as shown.- 4 Below the central vertical 7 line of this interpolar space is'located a receiving-hopper M, inclosed by an outlying arate-outlet-chutes; as, shown;

p The poles of the magnet preferablyincline toward each other from above downward for a purpose presently to be described, and'they inclined planes 0 ofbrass or othernon-magthe falling material during its descent. I also preferably provide eachpole-piece with a series of inclined recessesfb, communicatcharge into the hopper L. v

1 It will be noted that the fee'ding-hopper-K has two discharge-openings and that these in such manner as to feed the material into themagnetic field at points immediately adjacent to the faces of the pole-pieces. The material thus received passes down theseries netic material of very low diamagnetic susceptibility remains practically unaffected by the magnetic field,whereas the gold or other parti'-. cles of higher dia'magnetic susceptibility move magnetic intensity of the interpolar space. and drop-01f laterally from the edges of thelinclinese .in their endeavor to reach said neutral axis.

Inasmuch as the magnetic field becomes more.

and more concentrated toward the'bo'ttom. of the interpolar space, the cheat upon the brought within therang'e of the rec ei'ving cendescent partof theaocompanying sand, which remains closely adjacent to thepole-faces, passes gradually into the channels cthrough the inclined-apertures or recesses b, sothat the gold becomes continuously more-and more disembarrassed of accompanying sand from one incline to the other in the series, said sand order to prevent thema'terial from scattering So far-as I am aware it; is broadly new in "diamagnetic separation "to feed the material loutwardly toward the central zone of lesser receiving-hopper Ii, said hoppers havingsepare also preferably provided with a series of Tne'tic'material, whose function is to retard ing with a common channel c, adapted to disdischarge-openings are located, respectively,

of inclines a, and the Sandor other diamaggold particles becomes correspondinglyaugmented as'they descend until they are finally I tral hopper M. During this movement of 1 vbeing finally received in-the hopperI-i.- In

during its descent, I may convenientlyprm v vide the pole-pieces with sidest'rips or flanges, I ofnon-metallic material d, as shownin Fig. 2,

V into the interpolar space at points immedilately adjacent to the pole-faces and'tocolleet na'lly 1 moved out the. gold or other particles'of higherdiamagmagnetic intensity than that into which the mixture is fed, continuing it inland-subjecting it toheactijon of the afield until the diamagn'etic particles to be separated have gradfrom the. mixture toward said central zone oi lesser n'iagnetic intensity,

vand then collecting said particles separately as head's substantially as described.

'iarti'cles fro'in a inixtnrecontaining them, which consists in feeding theniixture into a magnetic field having a central zone of lesser'. nagnetie' intensity'than that into which the mixture isifed,rc onccntrating the field from,

I the point-of 'entryof' the inaterial omvard,

tral zone of'lesser magneticintensity,

thus described my invention, w vhat 7 of separating diamagnetic,

' particles from a 'lHlXllllF-G" containing them,

which consists infeeding the mixture into a magneticfield having a central zone-of lesser progressively withdrawing substantially as described. 2. The method'o-f separating diamagnetic,

cominning the material inland siibjecting to the action of. the field until the diamagnetie particles to be separated have gradnally moved out from the mixture tmvardsaid cemthen collecting said particles separately as heads; substantiallyas described.

3. The method of separating diama-gnetic particles froma mixture containing them;

which consists' in feeding the mixture into a magnetic field having a central zoneof-le'sser.

magnetic intensity thanthat intow l lich the mixture is fed, continningit-in-and subjecting it to "the action of-the field imtil the diam'agnet-i'c particles to be separated have gradvually moved out said central. zone of lesser magneticintensity,

I the spent inert material during the descent of the mass, and

finally collecting" the diamagnetie particles of v higher susceptibility separately .a's heads;

In testimony whereof affix my signature in presence of two Witnesses.

EIMER GATES.

Witnesses:

JOHN- C. PEnN E,

lI 'rcHINsoN, Jr.

from the mixture toward. 

